JPH02277928A - Multi-cylinder engine - Google Patents

Abstract

PURPOSE:To suppress the total height of a whole engine by forming a cooling water tank with a long tank in the engine width direction, and locating both end sections of the cooling water tank at positions arranged in the direction parallel with a crank shaft with respect to a suction manifold and an exhaust manifold assembly. CONSTITUTION:A fresh water tank 12 is long extended in the engine width direction (horizontal direction perpendicular to a crank shaft 1) along the end face 5 of a cylinder head 2. The side end face 26 of the head 2 at the end section 25 of the fresh water tank 12 is faced and neared to one end face of a suction manifold 10 in the longitudinal direction of the crank shaft 1. The head 2 side end face 28 of the other end section 27 of the tank 12 is faced and neared to the end face of an adjacent exhaust manifold assembly 11 in the longitudinal direction of the crank shaft 1. The cooling capability of a cooler 21 does not become insufficient even if the volume of the tank 12 is sufficiently secured and the capacity of the cooling water cooler 21 is set relatively small, thereby the total height is suppressed, and the total height of the whole engine is suppressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine having a plurality of cylinders in series, and more specifically, to improvements in the structure of a cooling water tank provided near the cylinder head. The target engine is

[Prior Art] In a multi-cylinder (for example, 6-cylinder) marine diesel engine, in addition to the exhaust manifold and intake manifold, fresh water (
A fresh water cooler for cooling the engine (cooling water) with seawater and a fresh water tank (cooling water tank) for cooling water are attached to the engine body. Furthermore, engines of the above type are often equipped with a turbocharger and an intercooler.

These devices are placed around the cylinder head; more specifically, the intake manifold and exhaust manifold are placed along the side of the cylinder head, and the fresh water tank and turbocharger are placed near the end face of the cylinder head. It is often placed in

[Problems to be Solved by the Invention] However, according to the above structure, since the various devices described above are provided on the upper part of the engine, it is inevitable that the overall height of the engine increases due to these devices.

In particular, since the fresh water cooler is placed above the exhaust manifold, the fresh water cooler tends to increase the overall height of the engine.

Furthermore, when the various devices mentioned above are installed on the top of the engine body, the overall appearance of the engine is lost, and the appearance deteriorates.More specifically, the appearance of the engine becomes reminiscent of high performance. It is difficult to finish the entire engine.

[Means for Solving the Problems] The present invention provides an engine block in which a plurality of cylinders are formed in series, the cylinder head of which is located at the upper end of the engine block, and the cylinder head extends generally parallel to the crankshaft. an intake manifold is disposed along one side, an exhaust manifold assembly is disposed along the other side of the cylinder head parallel to the side, the exhaust manifold assembly is provided with an exhaust manifold and a fresh water cooler, and the exhaust manifold assembly is provided with an exhaust manifold and a fresh water cooler; A cooling water tank is arranged along one end surface that is generally perpendicular to the side surface of the head, and the cooling water tank is formed by a tank that is long in the engine width direction, and both ends of the cooling water tank are connected to the intake manifold and the exhaust gas, respectively. Located parallel to the crankshaft with respect to the manifold assembly, there is a belt device below the cooling water tank that drives the engine's auxiliary equipment, and an auxiliary power supply installed at one end of the crankshaft. It is characterized by the fact that the joints for extraction are arranged vertically.

[Function] According to the above structure, the cooling water tank extends long over the entire width of the engine, so it is necessary to ensure a sufficient capacity of the cooling water tank, and therefore, even if the capacity of the cooling water cooler is set to be relatively small. , the problem of insufficient cooling capacity of the cooling water cooler does not occur. Therefore, the cooling water cooler can be made relatively small and its overall height can be suppressed, and as a result, the overall height of the entire engine can be suppressed.

Further, in the above structure, since both ends of the cooling water tank are close to the intake manifold and exhaust manifold assembly, these devices have a sense of unity in appearance, and the overall appearance of the engine is improved.

[Example] Fig. 1 is a plan view of an embodiment of the present invention, and Fig. 2 is a plan view of the embodiment of the present invention.
3 is a view taken along the line ■--■ of FIG. 1, and FIG. 4 is a partial view taken along the line IV--IV of FIG. 1.

In FIG. 1, the illustrated engine is an in-line six-cylinder diesel engine, the cylinder centerline of which is indicated by A. In the illustrated engine, the crankshaft 1 (only the center line is shown in Fig. 1) is arranged in a position that extends along its axis, and the engine block, which consists of a cylinder block and cylinder head 2, has the cylinder head 2 at the top of the engine. It is placed in a position. The entire cylinder head 2 is elongated and extends parallel to the crankshaft 1, and includes a pair of side surfaces 3.4 (surfaces parallel to the crankshaft 1) and a pair of end surfaces 5.6. Further, a valve arm chamber case 8 is fixed to the upper surface of the cylinder head 2, and a valve arm chamber is formed inside the valve arm chamber case 8.

The illustrated engine includes an intake manifold 10, an exhaust manifold assembly 11, and a fresh water tank 12 (cooling water tank).
, and a turbocharger 13 and an intercooler 14 are arranged around the cylinder head 2 and at approximately the same height as the cylinder head 2.

The intake manifold 10 extends along the side surface 3 of the cylinder head 2 over approximately the same length as the cylinder head 2, and is located on the opposite side of the exhaust manifold assembly 11 with the cylinder head 2 in between.

More specifically, the cylindrical body (the part shown in FIG. 1) of the intake manifold 10 is located at approximately the same height as the valve arm chamber case 8, and the cylindrical body protrudes downward from the cylindrical body. A curved outlet pipe 15 is fixed to the side surface 3 of the cylinder head 2, and an internal passage of the outlet pipe 15 is connected to an intake boat in the cylinder head 2.

A port 16 of the intake manifold 10 is provided on its outer side (the side opposite to the cylinder head 2). population 16
is shifted toward the end surface 6 with respect to the longitudinal center of the intake manifold 10. In this structure, there is a possibility that a large inertia is given to the intake air flowing into the outlet pipe 15a adjacent to the other end face 5 among the intake air flowing into the intake manifold 10 from the intake manifold 10, and as a result, the end face 5 In the cylinder adjacent to the cylinder, its intake air inflow state (especially swirl)
may be different from other cylinders. To prevent this, the intake manifold 1o has an outlet pipe 1 adjacent to the end face 5.
A space 17 is formed inside the intake manifold 10, which protrudes further toward the end surface 5 than the outlet pipe 15a. This space 17 has reached there! A damper effect is exerted on the intake air, thereby suppressing the inertia of the intake air flowing into the outlet pipe 15 adjacent to the space 17. As a result, the state of intake air flowing into the outlet pipe 1-5a is also the same as the state of intake air flowing into the other outlet pipes 15. This allows uniform combustion to be achieved in all cylinders.

The exhaust manifold assembly 11 extends along the side surface 4 for approximately the same length as the cylinder head 2. As shown in FIG. 2, the exhaust manifold assembly 11 is formed by an assembly of an exhaust manifold 20 and a fresh water cooler 21. The exhaust manifold 20 is connected to the cylinder head 2 (first
It extends parallel to the crankshaft 1 at approximately the same height as in the figure).

The fresh water cooler 21 is arranged above the exhaust manifold 2o and extends parallel to the crankshaft 1 over approximately the same length as the exhaust manifold 20 and at the same height as the valve arm chamber case 8 (FIG. 1).

Although not shown, fresh water that has cooled various parts of the engine flows into the fresh water cooler 21, and the fresh water is cooled with seawater.

In FIG. 1, the fresh water tank 12 extends long along the end surface 5 of the cylinder head 2 in the engine width direction (a direction perpendicular to and horizontal to the crankshaft 1). Fresh water tank 12
The end portion 25 is located in a range extending in the longitudinal direction of the intake manifold 10, and more specifically, the end portion 25 of
5, the cylinder head side end surface 26 faces one end surface of the intake manifold 10 in the longitudinal direction of the crankshaft,
And in close proximity.

The other end 27 of the fresh water tank 12 also protrudes to the extent that the exhaust manifold assembly 11 is extended in its longitudinal direction. It faces and is close to the end surface of the solid body 11 in the longitudinal direction of the crankshaft.

A crease 30 (step) is provided on the upper surface of the fresh water tank 12, and an upper surface portion 31 surrounded by the crease 30 is somewhat lower than the surrounding portion. The upper surface portion 31 is formed between the ends 25 and 27 and near the end surface 5, and is flat as a whole. This top part 3
A filler cap 32 is attached to 1, and a hole 33 is provided for attaching a water level alarm. The filler cap 32 protrudes upward from the upper surface portion 31, and its original function is that of the fresh water tank 12.
Although it is designed to reliably perform the function of venting air from inside, it protrudes only a very small amount from the uppermost part of the upper surface of the fresh water tank 12.

The turbocharger 13 is located on the opposite side of the fresh water tank 12 across the exhaust manifold assembly 11.

The intercooler 14 is located on the opposite side of the fresh water tank 12 with the intake manifold 10 in between, and is lined up with the turbocharger 13 in the engine width direction.

The upper ends or upper surfaces of each of the above-mentioned devices, that is, the intake manifold 10°, the exhaust manifold assembly 11, and the fresh water tank 12, are arranged on the same plane as the upper surface of the valve arm case 8 (i.e., the upper surface of the engine body). . Further, in the illustrated embodiment, the upper ends or upper surfaces of the turbocharger 13 and the intercooler 14 are also generally aligned on the same plane as the upper surface of the valve arm chamber case 8. Such a layout is also clearly shown in FIGS. 2-4.

The intercooler 14 described above has a generally rectangular parallelepiped outer wall, and an outlet air duct 40 extending from the end face on the intake manifold 10 side is connected to the inlet 16. An intake connecting pipe 41 on the inlet side of the intercooler 14 extends from the end surface of the intercooler 14 on the side opposite to the air duct 40 to the blower of the turbocharger 13.

This intake communication pipe 41 includes an upstream portion 42 that connects to the turbocharger 13, a downstream portion 43 that connects to the intercooler 14, and an intermediate portion 44 that connects both. The intermediate portion 44 extends generally in the engine width direction, and the upstream portion 42 and the downstream portion 43 are bent integrally from the ends of the intermediate portion 44 toward the turbocharger 13 side and the intercooler 14 side, respectively.

Inlet opening 4 of intercooler 14 to which section 43 connects
5 is rectangular, and its opening area is much wider than the passage cross-sectional area of the intermediate portion 44. Therefore, the downstream portion 43 is formed by a truncated quadrangular pyramid-shaped tube wall that widens as it goes from the intermediate portion 44 toward the opening 45 side.

More specifically, the tube wall of the downstream portion 43 is formed by combining four trapezoidal plates, and the tube wall portion formed by each trapezoidal plate is located at the center of the downstream portion 43! It is inclined with respect to the IC, and moves away from the center line C toward the opening 45 side.

Further, a partition plate 46 is provided inside the downstream portion 43 and the downstream portion of the intermediate portion 44 to separate the passage. The partition plate 46 is a generally vertical plate extending along the center line of the intake connecting pipe 41, and divides the inside of the intake connecting pipe 41 into a part close to the turbocharger 13 and the end face 6 and a part far from them. There is.

As described above, the small-diameter intermediate portion 44 of the intake connecting pipe 41 and the intercooler 14 are connected using the downstream portion 43 having a truncated pyramid shape.
Since the downstream part 43 and the intermediate part 44 are bent to each other, the intake air from the intermediate part 44 can be almost evenly distributed and supplied to the intercooler 14. Therefore, the intake air cooling effect of the intercooler 14 can be sufficiently enhanced.

The above-described structure related to the intercooler 14 and the intake connecting pipe 41 is also clearly shown in FIG. 4.

In FIG. 3, a belt cover 50, which is part of the belt transmission device, is disposed below the fresh water tank 12 and at a position shifted toward the exhaust manifold assembly 11. This belt transmission device is for driving auxiliary equipment such as a clean water pump 51 by the crankshaft 1, and the belt cover 50 covers the belt transmission device from the outer circumferential side and the side opposite to the engine body.

A mount 52 is attached to the end of the crankshaft 1 below the belt cover 50. The mount 52 is for extracting auxiliary power from the crankshaft 1, and an input shaft of a suitable device is connected to the mount 52 as required. The belt cover 50 has a generally triangular front shape as shown in FIG. 3, and is placed close to the exhaust manifold assembly 11 to fill the gap between the fresh water tank 12 and the mount 52.

Furthermore, as shown in FIG. 2, the ends of the belt cover 50 and the mount 52, that is, the parts furthest from the engine body in the crankshaft direction, are generally flush with the ends of the fresh water tank 12 furthest from the exhaust manifold assembly 11. lined up on top.

The shape and structure of the fresh water tank 12 described above are shown in FIGS. 5 and 6.
It is clearly shown in the figure. FIG. 5 is an enlarged partial view of the v--■ section in FIG. 1, and FIG. 6 is a view taken along the line Vl--Vl in FIG. In FIG. 5, the fresh water outlet 5 of the fresh water tank 12
5 is provided at the end of the bottom wall of the fresh water tank 12 on the right side in FIG. 5 (intake manifold 10 side in FIG. 1). Further, another outlet 56 is provided at a position adjacent to the outlet 55.

The outlet 55 and the outlet 56 are connected to the inlet passage 57 (
(suction passage). As mentioned above, the fresh water pump 51 is located below the fresh water tank 12, and its housing is fixed to the end of a cylinder block (not shown in FIG. 5) with a plurality of bolts. Entrance passage 57
is formed by an artificial pipe 59 that extends integrally from the main body housing of the fresh water pump 51 to below the outlet 55. The artificial pipe 59 also constitutes a leg portion to which the fresh water tank 12 is attached, and the lower surface of the fresh water tank 12 is fixed to the upper surface of the tip thereof. Further, on the opposite side of the main body of the fresh water pump 51 from the artificial pipe 59, a mounting leg 60 is integrally provided that protrudes upward. Fixed.

The lower half of the end of the fresh water tank 12 opposite to the outlet 55 (lower half of the left end in FIG. 5) is depressed, and the depressed space (
A communication pipe 65 is arranged in the recess). The connecting pipe 65 is
As shown in FIG. 6, one end is fixed to the end face of the fresh water cooler 21, and the cooling water outlet of the fresh water cooler 21 is connected to the connecting pipe 65.
It communicates with the inside of the fresh water tank 12 via an internal passage.

The communication pipe 65 has a flange 67 at the other end connected to the fresh water tank 12.
is fixed to a surface 68 (approximately parallel to the side surface 4 in FIG. 1) with bolts.

Of course, this installation requires that the opening 68 be provided to connect the internal passage of the communication pipe 65 and the inside of the fresh water tank 12.

The former outlet 55 communicates with the main part of the inside of the fresh water tank 12, that is, the part to which the communication pipe 65 is connected.

On the other hand, the outlet 56 at the other h° is connected to a bypass passage (not shown) formed inside the fresh water tank 12 separately from the main part.

The bypass passage inlet hole 70 (FIG. 1) is located near the exhaust manifold assembly 11 in the fresh water tank 12.
It is provided with an upward opening on the upper surface of the protruding lower half. Return cooling water from the engine body is supplied to this artificial hole 70 without passing through the fresh water cooler 21. A thermostat (not shown) for switching between the outlet 55 and the outlet 56 is provided at the tip of the artificial tube 59 shown in FIG.

As shown in FIG. 5, two mounting seats 72 (bosses with bolt holes) are provided at the cylinder head side end of the fresh water tank 12 in the vicinity of the filler cap '32.
In this installation, the seat 72 is fixed to a bracket (not shown) fixed to the engine body. The fresh water tank 11 is a cast product, and the fresh water tank 11 is provided with a plurality of sand removal holes 73 (only one is shown in FIG. 5), which are closed with screw caps after the casting operation.

As is clear from the above, the fresh water tank 12 is mounted so that the engine body is supported via a bracket fixed to the seat 72, and the fresh water cooler 21 is connected via the connecting pipe 65.
The engine body is supported by a clean water pump 51 fixed to the engine body, and is further supported at two locations on the lower surface.

According to the above-mentioned structure, in the installation shown in FIG. 5, the connecting pipe 65 with a complicated shape is arranged in the recessed space (four parts) of the fresh water tank 12 facing the surface 68, so that the connecting pipe 65 is visible from the outside. , the overall appearance of the engine may deteriorate. In order to prevent this, the following decorative board 75 is provided in the illustrated embodiment. The decorative board 75 is a curved member that covers almost the entire recessed space, and is located on the side opposite to the fresh water cooler 21 with respect to the communication pipe 65, as shown in FIG. 6, and is formed integrally with the communication pipe 65. ing.

The upper surface 80 of the fresh water tank 12 when viewed from the side as shown in FIG.
The whole is curved in a convex shape, and is inclined so that it becomes lower as it moves away from the clean water clarifier 21. By configuring the upper surface 80 in this way, even when the illustrated engine is used in a ship, the upper surface 80 can be kept generally horizontal, and the filler cap 32 shown in FIG. 1 can be located at the highest position of the fresh water tank 12.

That is, when the engine is installed on a ship, the crankshaft 1 is not exactly horizontal, but is installed in a slightly inclined position so that the mount 52 is at a higher position than the other end of the crankshaft 1. Even in such a tilted position,
By forming the upper surface 80 of the cooling water tank] 2 as described above, the upper surface 80 can be maintained generally horizontal.

[Effects of the Invention] According to the above structure, the fresh water tank 12 extends long over almost the entire width of the engine, so the fresh water tank 1
Therefore, even if the capacity of the fresh water cooler 21 is set to be relatively small, the problem of insufficient cooling capacity of the fresh water cooler 21 does not occur. Therefore, the fresh water cooler 21 can be made relatively small and its total height can be suppressed, and as a result, the total height of the entire engine can be suppressed.

By suppressing the overall height of the engine in this way, when the engine according to the present invention is used in a ship, problems such as a reduction in the cabin volume and a step on the deck caused by the engine can be solved.

Furthermore, in the structure according to the present invention, since both ends of the fresh water tank 12 are close to the intake manifold 10 and the exhaust manifold assembly 11, a sense of unity is created in the appearance of these devices.
The overall appearance of the engine has been improved, and more specifically,
The entire engine can be finished in an appearance that suggests high performance.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the present invention, and Fig. 2 is a - of Fig. 1.
■An arrow view, Figure 3 is a ■-■ arrow view in Figure 1, Figure 4 is a partial view of the IV-IV arrow in Figure 1, and Figure 5 is a V-■ diagram in Figure 1.
The enlarged cross-sectional partial view, FIG. 6, is a view taken along the line Vl--Vl in FIG. 5. 1...Crank? dl, 2-... cylinder head, 3
．． 4... Cylinder head side surface, 5.6... Cylinder head end surface, 8... Valve arm chamber case, 10... Intake manifold, 11... Exhaust manifold assembly, 12
... Fresh water tank, 21... Fresh water cooler Figure 3 Figure 4 Figure 5 Figure 6 Procedure correction (method) 1. Display of the case 1999 Patent Application No. 99727 2, Name of the invention Multi-cylinder engine 3, Person making the amendment Relationship to the case Patent applicant address 1-32 Chayamachi, Kita-ku, Osaka Name (678) Yanmar Diesel Co., Ltd. Representative Representative Director Atsushi Yamaoka 4, Agent address 7th floor, East Building, Chiyoda Building, 2-9-4 Higashitenma, Kita-ku, Osaka (@5303 5) Date of amendment order (dispatch mortar) Voluntary 6 , Subject of amendment Drawing 7, Contents of amendment as attached. 8. List of attached documents Drawings 1 copy Figure 3 Figure 4

Claims (1)

[Claims] 1. An engine block in which a plurality of cylinders are formed in series is provided with the cylinder head thereof located at the upper end of the engine block, and the cylinder head is provided along one side surface extending generally parallel to the crankshaft. an intake manifold is disposed along the other side of the cylinder head parallel to the side, an exhaust manifold assembly is provided with an exhaust manifold and a fresh water cooler;
A cooling water tank is arranged along one end surface that is generally orthogonal to the side surface of the cylinder head, and the cooling water tank is formed by a tank that is long in the engine width direction, and both ends of the cooling water tank are connected to the intake manifold and A belt device for driving the engine's auxiliary equipment and an auxiliary device installed at one end of the crankshaft are located below the cooling water tank in a position parallel to the crankshaft relative to the exhaust manifold assembly. An engine characterized by having joints for power extraction arranged vertically. 2. The engine according to claim 1, wherein the upper surface of the cooling water tank is inclined so as to approach the crankshaft center line as it moves away from the cylinder head, and is curved in a convex shape. 3. Claim 1 or 2, wherein a cooling water pump is attached to the end face of the engine block below the cooling water tank, and the housing of the cooling water pump is provided with mounting legs for supporting the cooling water tank. Engines listed in.